Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Add modify output file function

    JIRA: BOTTLENECK-176

    Add function which could modify outfile name.
    Also a bug fix about yardstick docker version should be danube.3.1

    Change-Id: I0e0bb5b26cae44358311d17932c698505560974c
    Signed-off-by: liyin <liyin11@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 5eb95ef..5b75906 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 5eb95eff44e5e2ed35dc04cfe73549a8a160d8ce
+Subproject commit 5b75906f3bcf91355bed14311d79d49d65982b6d